<?php

/**
 * This is the model class for table "tbl_course_teacher".
 *
 * The followings are the available columns in table 'tbl_course_teacher':
 * @property integer $course_id
 * @property integer $teacher_id
 * @property integer $status
 *
 * The followings are the available model relations:
 * @property TblTeacher $teacher
 * @property TblCourse $course
 */
class CourseTeacher extends CActiveRecord
{
    /**
     * @return string the associated database table name
     */
    public function tableName()
    {
        return 'tbl_course_teacher';
    }

    /**
     * @return array validation rules for model attributes.
     */
    public function rules()
    {
        // NOTE: you should only define rules for those attributes that
        // will receive user inputs.
        return array(
            array('course_id, teacher_id, status', 'required'),
            array('course_id, teacher_id, status', 'numerical', 'integerOnly'=>true),
            // The following rule is used by search().
            // @todo Please remove those attributes that should not be searched.
            array('course_id, teacher_id, status', 'safe', 'on'=>'search'),
        );
    }

    /**
     * @return array relational rules.
     */
    public function relations()
    {
        // NOTE: you may need to adjust the relation name and the related
        // class name for the relations automatically generated below.
        return array(
            'teacher' => array(self::BELONGS_TO, 'Teacher', 'teacher_id'),
            'course' => array(self::BELONGS_TO, 'Course', 'course_id'),
        );
    }

    /**
     * @return array customized attribute labels (name=>label)
     */
    public function attributeLabels()
    {
        return array(
            'course_id' => 'Course',
            'teacher_id' => 'Teacher',
            'status' => 'Status',
        );
    }

    /**
     * Retrieves a list of models based on the current search/filter conditions.
     *
     * Typical usecase:
     * - Initialize the model fields with values from filter form.
     * - Execute this method to get CActiveDataProvider instance which will filter
     * models according to data in model fields.
     * - Pass data provider to CGridView, CListView or any similar widget.
     *
     * @return CActiveDataProvider the data provider that can return the models
     * based on the search/filter conditions.
     */
    public function search()
    {
        // @todo Please modify the following code to remove attributes that should not be searched.

        $criteria=new CDbCriteria;

        $criteria->compare('course_id',$this->course_id);
        $criteria->compare('teacher_id',$this->teacher_id);
        $criteria->compare('status',$this->status);

        return new CActiveDataProvider($this, array(
            'criteria'=>$criteria,
        ));
    }

    /**
     * Returns the static model of the specified AR class.
     * Please note that you should have this exact method in all your CActiveRecord descendants!
     * @param string $className active record class name.
     * @return CourseTeacher the static model class
     */
    public static function model($className=__CLASS__)
    {
        return parent::model($className);
    }
    
    public static function filterTeacher($course_id, $teacher_id)
    {
        $model = CourseTeacher::model()->findAll('course_id=:id AND status=1', array(':id'=>$course_id));
        foreach ($model as $d)
        {
            if ($d->teacher_id == $teacher_id)
            {
                return true;
            }
        }
        
        return false;
    }
}